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.sh see also
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.br getmntent (3),
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.br fstab (5)
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.sh colophon
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this page is part of release 5.13 of the linux
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.i man-pages
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project.
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a description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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\%https://www.kernel.org/doc/man\-pages/.
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.so man3/ctime.3
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.\" copyright (c) 2017, michael kerrisk <mtk.manpages@gmail.com>
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.\"
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.\" %%%license_start(verbatim)
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.\" permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" since the linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. the author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. the author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%license_end
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.\"
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.th pthread_spin_lock 3 2021-03-22 "linux" "linux programmer's manual"
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.sh name
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pthread_spin_lock, pthread_spin_trylock, pthread_spin_unlock \-
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lock and unlock a spin lock
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.sh synopsis
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.nf
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.b #include <pthread.h>
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.pp
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.bi "int pthread_spin_lock(pthread_spinlock_t *" lock );
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.bi "int pthread_spin_trylock(pthread_spinlock_t *" lock );
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.bi "int pthread_spin_unlock(pthread_spinlock_t *" lock );
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.fi
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.pp
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compile and link with \fi\-pthread\fp.
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.pp
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.rs -4
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feature test macro requirements for glibc (see
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.br feature_test_macros (7)):
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.re
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.pp
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.br pthread_spin_lock (),
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.br pthread_spin_trylock ():
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.nf
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_posix_c_source >= 200112l
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.fi
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.sh description
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the
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.br pthread_spin_lock ()
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function locks the spin lock referred to by
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.ir lock .
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if the spin lock is currently unlocked,
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the calling thread acquires the lock immediately.
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if the spin lock is currently locked by another thread,
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the calling thread spins, testing the lock until it becomes available,
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at which point the calling thread acquires the lock.
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.pp
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calling
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.br pthread_spin_lock ()
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on a lock that is already held by the caller
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or a lock that has not been initialized with
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.br pthread_spin_init (3)
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results in undefined behavior.
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.pp
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the
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.br pthread_spin_trylock ()
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function is like
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.br pthread_spin_lock (),
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except that if the spin lock referred to by
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.i lock
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is currently locked,
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then, instead of spinning, the call returns immediately with the error
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.br ebusy .
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.pp
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the
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.br pthread_spin_unlock ()
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function unlocks the spin lock referred to
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.ir lock .
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if any threads are spinning on the lock,
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one of those threads will then acquire the lock.
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.pp
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calling
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